/* =========================================================================
   login.css —— 登录页 (WS-04A)
   深色工业风：纯 CSS 网格 + 管线暗纹背景，禁止大图 / 外链资源
   ========================================================================= */

.login-screen {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100%;
  overflow: hidden;
  padding: 24px;
  box-sizing: border-box;
}

/* 工业网格 + 顶部暖光（纯 CSS，无图） */
.login-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(70, 214, 224, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(70, 214, 224, .05) 1px, transparent 1px),
    radial-gradient(900px 520px at 50% -22%, rgba(245, 166, 35, .10), transparent 60%);
  background-size: 34px 34px, 34px 34px, 100% 100%;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .92), rgba(0, 0, 0, .42));
          mask-image: linear-gradient(180deg, rgba(0, 0, 0, .92), rgba(0, 0, 0, .42));
}

/* 模拟管线暗纹（横 / 竖） */
.login-glow {
  position: absolute;
  left: 50%; top: 36%;
  width: 540px; height: 540px;
  transform: translate(-50%, -50%);
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(circle, rgba(70, 214, 224, .10), transparent 62%);
}
.login-glow::before,
.login-glow::after { content: ""; position: absolute; background: repeating-linear-gradient(90deg, rgba(255, 255, 255, .035) 0 2px, transparent 2px 22px); }
.login-glow::before { left: -220px; right: -220px; top: 42%; height: 2px; }
.login-glow::after  { left: 47%; top: -220px; bottom: -220px; width: 2px; background: repeating-linear-gradient(0deg, rgba(255, 255, 255, .035) 0 2px, transparent 2px 22px); }

.login-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: linear-gradient(180deg, rgba(17, 27, 38, .86), rgba(12, 20, 29, .92));
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 30px 26px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .5);
}

.login-logo { font-size: 54px; filter: drop-shadow(0 0 22px rgba(245, 166, 35, .4)); }
.login-title { font-family: var(--mono); font-size: 30px; letter-spacing: 6px; margin: 10px 0 2px; color: #fff; }
.login-sub { color: var(--dim); letter-spacing: 3px; font-size: 13px; margin-bottom: 22px; }
.login-label { align-self: flex-start; color: var(--dim); font-size: 12px; letter-spacing: 1px; margin: 0 0 8px; }

.login-input {
  width: 100%;
  min-height: 46px;            /* ≥44px 触控 */
  padding: 12px 14px;
  font-size: 16px;
  color: var(--ink);
  background: #0c1620;
  border: 1px solid var(--line);
  border-radius: 8px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  box-sizing: border-box;
}
.login-input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(70, 214, 224, .12); }
.login-input::placeholder { color: #516274; }

.login-start {
  width: 100%;
  min-height: 46px;            /* ≥44px 触控 */
  margin-top: 16px;
  font-size: 16px;
  text-align: center;
  justify-content: center;
}
.login-start:disabled { opacity: .5; cursor: not-allowed; }

.login-tip { min-height: 18px; margin-top: 10px; font-size: 13px; color: var(--red); }

.login-version {
  position: absolute;
  bottom: 14px; left: 0; right: 0;
  text-align: center;
  color: #516274;
  font-size: 12px;
  letter-spacing: 1px;
  z-index: 1;
}

@media (max-width: 560px) {
  .login-title { font-size: 25px; letter-spacing: 3px; }
  .login-logo { font-size: 46px; }
}